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https://www.whoop.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.20 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

16.78 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

1.22 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.006

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

9.65 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

19.34 s

Page Load Progression

852 ms
1.7 s
2.6 s
3.4 s
4.3 s
5.1 s
6.0 s
6.8 s
Checks
16
7 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
8.3 MB transferred, 138 requests
FIX
8.3 MB transferred, 138 requests
Critical::
Page weighs 18.0 MB (8.3 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
138 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.7 g CO2 per page load
8.3 MB / 2.4 MB budget
8.3 MB transferred
138 requests
1.7 g CO2 per page load
Other 5.7 MiB 69%
JavaScript 1.5 MiB 18%
Images 643.6 KiB 8%
Fonts 149.3 KiB 2%
Other 140.7 KiB 2%
CSS 99.4 KiB 1%
HTML 65.8 KiB 1%
Other 5.7 KiB 0%
Other 2.7 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
88% third-party, 0 ms blocking
FIX
88% third-party, 0 ms blocking
Warning::
Third-party code accounts for 88% of page weight (7.3 MiB of 8.3 MiB)
Info::
Third-party blocking time is low (0 ms)
88%
First-party Third-party
F
JS Execution Cost
Action
7220ms total JS execution
FIX
7220ms total JS execution
Warning::
https://www.whoop.com/_next/static/chunks/935-81a2...: 1161ms CPU time
Warning::
Unattributable: 1154ms CPU time
Warning::
https://www.whoop.com/fr/en/: 1149ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NGF...: 680ms CPU time
Warning::
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4...: 365ms CPU time
Warning::
Third-party scripts: 3889ms (54% of total)

Main Thread Breakdown

Script Evaluation 51% Other 21% Script Parsing & Compilation 12% Style & Layout 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.whoop.com/_next/static/chunks/935-81a2d84af5610b1e.js1161ms1031ms12ms1st
Unattributable1154ms140ms0ms3rd
https://www.whoop.com/fr/en/1149ms125ms204ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-NGFF9PP680ms621ms42ms3rd
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4386-85b5-d82a8940401a/main.js?cb=11F269417CC438CF09843839F630DC61365ms129ms38ms3rd
https://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.js308ms219ms41ms3rd
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4386-85b5-d82a8940401a/custom_box.js?cb=E31AE4E9BD9D72141647E36CE7B927FB295ms266ms8ms3rd
https://www.whoop.com/_next/static/chunks/689-8849113a05230344.js269ms122ms147ms1st
https://cdn.cookielaw.org/consent/321e0df6-a53c-40aa-96e7-99a58d1865a5/OtAutoBlock.js254ms86ms139ms3rd
https://www.whoop.com/_next/static/chunks/b6cf391a-1cc14d6d1d37aa64.js199ms22ms9ms1st

Showing top 10 of 22 scripts

F
JS Bundles
Action
45 scripts, 619 KB unused
FIX
45 scripts, 619 KB unused
Warning::
https://www.whoop.com/_next/static/chunks/689-8849...: 274 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NGF...: 63 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202503.1...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4...: 60 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4...: 43 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 619 KB
619 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.whoop.com/_next/static/chunks/689-8849113a05230344.js328 KB274 KB (84%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-NGFF9PP139 KB63 KB (45%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202503.1.0/otBannerSdk.js116 KB63 KB (54%)✓3rd
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4386-85b5-d82a8940401a/main.js?cb=11F269417CC438CF09843839F630DC61116 KB60 KB (52%)✓3rd
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4386-85b5-d82a8940401a/lightbox_builder.js?cb=F96ACFC6CCCE1091C48E3BD493FEDB430 KB43 KB (64%)✓3rd
https://www.lightboxcdn.com/vendor/7206db4b-ab9c-4386-85b5-d82a8940401a/lightbox_builder.js?cb=F96ACFC6CCCE1091C48E3BD493FEDB4367 KB43 KB (64%)✓3rd
https://www.whoop.com/_next/static/chunks/app/%5Bregion%5D/%5Blocale%5D/%5B...slug%5D/page-d3feb99a95c96d6c.js67 KB39 KB (59%)✓1st
https://www.whoop.com/_next/static/chunks/318-e9fc07735cb3de9c.js47 KB35 KB (76%)✓1st
https://www.whoop.com/_next/static/chunks/app/%5Bregion%5D/%5Blocale%5D/error-8fd7c5671f3b4783.js2 KB—✓1st
https://www.whoop.com/_next/static/chunks/935-81a2d84af5610b1e.js32 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
Image Optimization
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Info::
All images are well-optimized
31 images 632 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
15 fonts (149 KB)
PASS
15 fonts (149 KB)
Info::
15 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

15

149 KB total

Render-blocking

0

of 15

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 3.2 s LCP 16.8 shttps://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 29.3 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 29.3 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 30.2 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 30.0 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/144da4/00000000000000007735e619/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3l https://use.typekit.net/af/144da4/00000000000000007735e619/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3 — 30.5 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/144da4/00000000000000007735e619/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3l https://use.typekit.net/af/144da4/00000000000000007735e619/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/144da4/00000000000000007735e619/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3l https://use.typekit.net/af/144da4/00000000000000007735e619/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i6&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 0 B — 0 ms — font-display: swaphttps://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 0 B — 0 ms — font-display: swap
l woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
2
preload
4
dns-prefetch
—
prefetch
—

6 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
138 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
54% of JavaScript execution is third-party
First-party Third-party 3889ms · 616KB · €21/mo
Unattributable
Other
Costly
Execution 1154ms
Transfer 0 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 680ms
Transfer 139 KB
Unused 45%
Monthly Cost €4/mo
www.lightboxcdn.com
Other
Costly
Execution 365ms
Transfer 116 KB
Unused 52%
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 308ms
Transfer 116 KB
Unused 54%
Monthly Cost €2/mo
www.lightboxcdn.com
Other
Costly
Execution 295ms
Transfer 0 KB
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 254ms
Transfer 135 KB
Monthly Cost €1/mo
api.lightboxcdn.com
Other
Optional
Execution 159ms
Transfer 1 KB
Monthly Cost €1/mo
Amplitude
Analytics
Optional
Execution 128ms
Transfer 37 KB
Monthly Cost €1/mo
Amplitude
Analytics
Optional
Execution 122ms
Transfer 52 KB
Monthly Cost €1/mo
www.lightboxcdn.com
Other
Optional
Execution 102ms
Transfer 2 KB
Monthly Cost €1/mo
www.lightboxcdn.com
Other
Optional
Execution 96ms
Transfer 0 KB
Unused 64%
Monthly Cost €1/mo
www.lightboxcdn.com
Other
Optional
Execution 84ms
Transfer 5 KB
Monthly Cost €0/mo
www.lightboxcdn.com
Other
Optional
Execution 74ms
Transfer 4 KB
Monthly Cost €0/mo
OneTrust
Consent
Essential
Execution 68ms
Transfer 9 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 1154ms and costs ~€6/month
  • Google Tag Manager adds 680ms and costs ~€4/month
  • www.lightboxcdn.com adds 365ms and costs ~€2/month
  • www.lightboxcdn.com adds 295ms and costs ~€2/month

54% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1154ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 680ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.lightboxcdn.com takes 365ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

52% of www.lightboxcdn.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

54% of OneTrust's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.lightboxcdn.com takes 295ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

64% of www.lightboxcdn.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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